This image of the Mars Pathfinder Lander on the surface of Mars was imaged by NASA's Sojourner as it looks back. Sojourners tracks are visible in the foreground. Sol 1 began on July 4, 1997.

This image of the Mars Pathfinder Lander on the surface of Mars was imaged by Sojourner as it looks back. Sojourners tracks are visible in the foreground.

Photojournal note: Sojourner spent 83 days of a planned seven-day mission exploring the Martian terrain, acquiring images, and taking chemical, atmospheric and other measurements. The final data transmission received from Pathfinder was at 10:23 UTC on September 27, 1997. Although mission managers tried to restore full communications during the following five months, the successful mission was terminated on March 10, 1998.

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